I'd say IG-88. Looking at the list of weapons he's got, I'd say he's a New York reloader, and I seem to recall from Therefore I Am (Kevin Anderson's horrible story about him) that his armor shrugs off laser fire like no ****er's business. So my bet would be on him.

"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill

"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier